Drilling apparatus



July 5, 1938. J. c. CURTIS 2,122,515

DRILLING APPARATUS original Filed sept. 2e, 1934 4 sheeis-sheet 1 i/oH/v c: cafe 775 INVENTOR ATTORNEY July 5, 1938. J. c. CURTIS l 2,122,515

DRILLING APPARATUS I Original Filed Sept. 26, 1934 4 Sheets-Sheet 2 1 ll l /ll/l /l mg. 2 JOHN C. (TU/9776' l INVENTOR SYM ATTORNEY July 5, 1938o .1. c. cuRTls DRILLING APPARATUS Original Filed Sept. 26, 1934 4 Sheets-Sheet 3 l,.ll

F 6 ./oH/v c caer/s INVENTOR ATTORNEY July 5, 1938 J. c. cuRTls 2,122,515

DRILLING APPARATUS Original Filed Sept. 26, 1934 4 Sheets-Sheet 4 Figi) JOHN C. CUET/S INVENTOR ATTORNEY Patented July 5, 1938 PATENT OFFICE 2,122,515Y DRILLING APPARATUS.

John C. Curtis, Garfield Heights.' Ohio, assignor to The Cleveland Rock 'Drill Company, Cleveland, Ohio, a corporation of Ohio Application September 26, 1934, Serial No. 745,616 Renewed October 23, 1937 23 Claims.

This invention relates broadly to rock drills,

but more particularly to a portable drilling rig generally known in the art as wagon drill.

One object of this invention is torproduce a portable drilhng rig kcomprising a wheel supported carrying frame having a drilling mechanism mounted thereon for longitudinal slidable adjustment relative to the carrying frame. e

Another object of this invention Iis to produce a wheel supported carrying frame having a rock drill supporting frame mounted thereon .for pivotal and slidable adjustment relative to the carrying frame. Y Y

AnotherI object of `this invention is to provide a wagon drill with a carrying frame formed with an open end and having a drilling mechanism supporting frame slidable thereon with the drilling mechanism adjustable longitudinally of the carrying frame through the open end thereof Another object of this invention is kto produce a wagon drill including a carrying frame and a drill supporting framewith simple and efficient connecting means therebetween whereby the drill y supporting vframe may be adjusted in height and 25 longitudinally of the carrying frame'. v Another object of this invention is to provide a Wagon drill comprising a carrying frame and a drill supporting frame pivotally connected thereto, with means adjustablymounted on the carrying frame and oonnectable with the drill supporting frame for eifecting the pivotal movement thereof. Y y y ,Other objects and advantages more or less ancillary to the foregoing and the mannerin which the various .objects are attained, reside in the specific construction and aggroupment of the elements peculiar to this structure, as will become apparent from va more complete examination of this specication, in the claims of which there` are assembled certain specific combinations of parts and specific constructions indicative of the scope and spirit of the invention.

In the drawingswhich illustrate the invention: Fig. l isa side elevational view of the entire drilling rig illustrating the drilling mechanism in .perpendicular relation with the wheel supported frame.

Fig, 2 is an end elevational view of the drilling rig shown in Fig. 1. 50 Fig. 3 is an enlarged sectional view taken in a plane indicated by line 3-3 in Fig. l.

Fig. Ll .is an enlarged fragmental view .of the wheel support as shown in Fig. 2..

Fig.. 5is any enlarged crosssectional View taken 55 in s pene mdicaea'by une s-s in ng. 4.

Fig. 6 is a view similar to Fig. l showing the drilling mechanism in another position.

Fig. 7 is a view similar to Fig. 2 illustrating the drilling mechanism positioned for drilling holes in a ditch. Y

Fig. `8 is a top plan View of the drilling rig illustrating the drilling mechanism in a vertical position, `and the wheels located for longitudinal movement of the carriage.

Fig. 9 is a view similar to Fig. 8 illustrating the drilling mechanism in a horizontal position and the wheels located for transversal movement of the carriage.

Referring to the drawings in which like symbols designate corresponding parts throughout the different views, represents a carrying frame preferably formed by two tubular parallel side members or arms 2| and 22 united by a tubular end member or cross arm 23, which is preferably. rigidly and permanently secured to the side members to form a single unit, of a substantially U shape, having the central portion as well as one end thereof open for the purposes which will vbe explained later. Aixed to each side members 2| and ,22, and preferably near the free end thereof, there is a casting 2 4 extending laterally therefrom and secured thereto by bolts 25. The casting 24 is slotted to receive the square end portion 26 of a shaft l2'! extending therefrom and on which is rotatably mounted a Wheel 28. The squarey portion 2'6 of the shaft 21 is pivotally secured Within the casting 24 by a bolt 29 transversally disposed through the casting and the square portion of the shaft. Toward its free end, the square portion 2 6 is provided with a transversally disposed 4aperture 30 capable of individual registration withv similarly disposed apertures l37| and 32 provided within the casting 24, and adapted to receive a pin 33 by which the shaft 21, and consequently the Wheel 28, may be locked against pivotal movement. Secured to the end member 23, there is a bracket 34 having rotatablel therein the shaft portion 35 of a fork shaped support 36, which is provided with a cross shaft 31 having vrotatable thereon a small wheel 38. Located Aabove the end member 23 and extending( the full length thereof, there is a handle 39 which is welded to the side members of the frame 2D.

Carried by the frame 20, there is a three sided tool supporting frame 40 comprising two parallel legs or., side arms 40 united at one end by a cross member or `arm 40" constituting a substantially U-,shaped member of Va lesser width than that of the carrying frame 20. To assure rigidity, the

cross arm 40" is welded or otherwise rigidly secured to the legs 49', thus resulting in a tool supporting frame forming a single unit.

The tool supporting frame 40 is disposed transversely of the carrying frame 4| with each leg of the former movably connected to the corresponding side member of the latter through a connection comprising a transversely disposed cone member 4| rigidly secured to the free end of each leg 46. This cone member is rotatably mounted within a corresponding socket member 42, which is formed with a longitudinally disposed semicircular seat 4.; engaging the corresponding side member of the frame 20. socket member 42, there is a cap 45 also provided with a semi-circular seat 41 engaging the side member of the carrying frame 20, and forming with the seat 43 sliding bearings for the tool supporting frame 4|). Extending from the socket member 42 through its component cap 45, there are two bolts 44 adapted` to receive nuts 46 by which the socket member, and consequently the tool supporting frame 46, may be locked on the frame 2i) against slidable movement. The cone member 4|, and consequently the drill supporting frame 46, may also be locked against pivotal movement relative to the frame 20 by a bolt 48 leading from the socket member 42 through the cone member 4| to receive a nut 49. From the foregoing description, it will be understood that the free ends the frame 4|) are located inside of the carrying frame and are connected thereto Y by two indentical connections each including sliding 'bearings 43 and 41 which may be clamped` on the carrying frame against slidabie movement relative thereto, and that the same connections also include pivotal bearings in the form of taper mating surfaces which may be locked against relative rotation.

Detachably secured to the cross arm 4D of the tool supporting frame 46 by bolts 50, there is the usual saddle 5i formed with a socket adapted to pivotaily receive acone member 52 which maybe locked therein by a clamp 53 and bolt |54. The cone member 52 is integrally aflixed to a drill guiding frame 55 at a place substantially equidistant from the ends thereof. This drill guiding frame includes a pair of parallelguides 56 secured to a tube 68 by bolts 51. S-lidably mounted within the guides 56, there is a slabback 58 having secured thereto by clamps 59 a fluid actuated drilling motor 60. The tube 68 is adapted to accommodate therein a fluid actuated feeding mechanism capable of imparting feeding motion in both directions to the drilling motor 60 by a exible member or chain 63, which is connected to the slabback 58 by a clamp 54. The length of this drill guiding frame may be such as to meet any desired condition. In practice it is generally long enough to have its lower end positioned within the open end of the carrying frame when the rig is set for drilling vertical holes as shown in Fig. 1. For purpose of illustration, this drill guiding frame is shown to be of a type similar to the one described in United States Patent No. 2,029,223, but it is to be understood that any other suitable drilling mechanism, wherein the drilling motor is slidably mounted on a drill guiding frame, could well be substituted for the ;one above described without departing from the ably secured to the cone member 4| by a clamp Cooperating with each 61. This post carries a hoisting mechanism for the tool supporting frame 40 including a pulley 10 secured thereto by a hook 69. This pulley is adapted to receive a rope or cable 1| leading from the drum of a hand operated winch 12, which is detachably secured to the stanchion 66 by a clamp 13. To the free end of the cable 1| is afxed a hook 14 capable of engaging the cross arm 40" of the frame 4|).

Detachably secured to theY tool supporting vframe 40 by means of a clamp 15, there is an arm 16. Similarly secured to each of the side members of the frame 26 by a clamp 11, there is a rotatable housing 18 adapted to slidably receive an anchoring peg 19, which may be locked therein by a bolt 80. Toward the front end of the tube 68, the latter is provided with a housing 8| welded thereon, and having slidable therethrough an anchoring peg 82, which may be secured in position by a screw 83.

In practice, by loosening the bolts 50, the entire drilling apparatus may be rotated and siid on the cross arm 40 of the tool supporting frame 40, that is, on a transversal agis relative to the carrying frame. In other words, the drilling apparatus may revolve around the center axis of the cross arm 40, with at least one end of the drill guiding frame 55 passing through the open end of the carrying frame, thus enabling the drilling apparatus to be positioned either vertically, angularly or horizontally with respect to the carrying frame. By loosening the bolt 54, the entire drilling apparatus may also be rotated on an aXis perpendicular to the cross arm 46", allowing thereby the lower end of the drill guiding frame in Fig. to be moved from one of the side members of the carrying frame to the other.

Due to the movable connections between the carrying frame 26 and the tool supporting frame 4l), the entire drilling apparatus may be elevated or lowered relative to the carrying frame by simply loosening the nuts 49. To facilitate the raising of the tool supporting frame and checking its downward movement, the hoisting mechanism carried by the post 66 may be connected to the frame 40 by attaching the free end of the flexible member or cable 1| to the cross arm 40" by the hook 14.

In practice, it has been found desirable to d maintain the weight of the drill guiding frame substantially on the aXis of the'wheels 28, facilitating thereby the moving of the rig and maintaining the center of gravity inside of the marginal edge oi the carrying frame 2|). In the present construction, due to the pivotal and slidable connections between the two frames, the drilling apparatus may be adjusted in height reiative to the carrying frame, with the weight of the former remaining on the wheels 28. In this instance, the tool supporting frame 46 may be rotated and simultaneously slid on the carrying frame to cause the upward or downward movement of its cross arm 40 within a plane perpendicular to the carrying frame.

Due to the movable connections between the two frames, it will be understood that the drill supporting frame is capable of independent pivotal and slidable movements relative to the carrying frame, and may be locked against one of said movements irrespective of theV other. To allow the swinging movement of the drill guiding frame resulting either from the pivotal connection between the latter and the tool supporting frame or between the tool supporting frame and the carrying frame, the space betweenl the two cone members 4l has been left unobstructed, thus enabling the swinging movement of the drill guiding frame .through the open center and the openend of the carrying frame, and between the legs of the tool supporting frame. It will also be understood that due to the movable connections and the unobstructed space above referred to, the drilling apparatus is adjustable from above to below the carrying frame. Furthermore since the supporting frame 40 is of a lesser width than that of the carrying frame 20, the formerV may be positioned within the latter to form a substantially flat rectangular structure adjustable in length. Y

When it is desired to drill in a ditch or trench, the drilling apparatus may be positioned as illustrated in Fig. 7, with the tool supporting frame 4S swung through the carrying-name2() for positioning the ydrilling apparatus well into the trench. If the trench is longer than the distance between the wheels 28 and 38, the frame may be supported above the trench by the wheels 28 in straddle relation with the trench, and by the anchoring pegs i9 secured to the side members of'` the frame 28.

The post carrying the hoisting mechanism includingVV the hand winch l2, may be pivoted or slid relative to the carrying frame 20, and may also be rotated on its own aXis for locating the hoisting mechanism in the most advantageous position for either elevating, lowering or sliding the tool supporting frame 4B relative to the carrying frame 2G.

The entire drilling apparatus. may be moved on the ground in a direction transversal to the carrying frame 2?, by moving the wheels 28 from the position shown in Fig. 8 to the position shown in Fig. 9. This may be ydone by simply removing the pin 33 from the hole 32, turning each wheel and shaft 2l until the aperture 30 registers with the aperture 3i, then reinserting the pin 33 for locking the wheel in the new position.

When it is desired to drill holes outside of the carrying frame 2t, the saddle 5l together with the drill guiding frame 55 may be mounted in the usual manner on the arm 16, which is secured on the tool supporting frame 40 byV a clamp l5. By loosening this clamp, the arm 16 may be swung around or slid on the side leg of the frame on which it is mounted, thus permitting the drilling of holes outside of the carrying frame in different directions.

When starting the drilling of ay hole, the front end of the drill guiding frame 55 may be secured against movement relative to the work by driving the anchoring peg 82 into the ground, and locking the peg to the housing 8| by tightening the bolt 83.

.Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology'is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modication of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

l. In a drilling apparatus, a mechanism for supporting and guiding a drill comprising a carrying frame, a substantiallyV U-shaped member `supported by. said frame, connections between 1 saidv member and frame including tapered mating surfaces affording the pivotal movement of said member relative to said frame, said connections arranged and disposed in a manner affording the slidable movement of said member relative to said frame, a drill guiding frame detachably secured to the cross arm of said member, and means operable for causing the forcible interengagement of said tapered surfaces for locking said member against pivotal movement irrespective of the slidable movement thereof.

2. In a portable drilling rig, the combination of a carrying frame, bearings carried by said frame capable of longitudinal slidable movement relative thereto, a substantially U-shaped tool supporting frame having the free end portion of the side arms thereof pivotally and slidably connected by said bearings to said carrying frame, a rock drilling mechanism supported by the cross arm of said supporting frame, and means forming a part of said bearings for holding said tool supporting frame in adjusted positions, said supporting frame due to the pivotal and slidable connections with said carrying frame being adjustable to position said drilling mechanism in diierent heights with respect to said. carrying frame within a plane perpendicular to the latter. 3 In a drilling apparatus, a mechanism for supporting and guiding a drill comprising a carrying frame, bearings carried by said frame in slidable engagement therewith, a substantially U-shaped member having the free end portion of each side arm thereof pivotally and slidably connected by said bearings to said frame, a drill guiding frame detachably secured to the cross arm of said substantially U-shaped member, and means forming a part of said bearings for holding said member in adjusted position.

4. In a portable drill rig, the combination of a carrying irame including at least two parallel side members having an open space therebetween, supporting wheels for said frame, a substantially U-shaped tool supporting frame including two side arms and a cross arm, a drill detachably secured to the cross arm of said tool supportingr frame and connecting means carried by each of said side members by which said tool supporting frame is connected to said side members and capable of longitudinal slidable and pivotal movement therebetween, said connecting means including means for establishing a rigid connection between said frames in any drilling position assumed by said drill due to the movements of said supporting frame.

5. In a portable drilling rig, the combination of a substantially flat carrying frame having an open centensupporting wheels for one end of said frame each rotatable on an axle extending laterally from said frame, the space between said wheels being unobstructed, a substantially U-shaped tool supporting frame including tivo side legs and a cross arm, slidable connections between the free end portion of said legs and said carrying frame, the space between said slidable connections being unobstructed, a rock drill mechanism supported by said cross arm' on an aXis perpendicular to the slidable axis of said supporting frame, one end of said drilling mechanism being capable of movement through the open center of the carrying frame and between said wheels and said slidable connections, said drilling mechanism being adjustable longitudinally of said carrying frame due to the slidable movement of the supporting frame, and means for locking the two frames against relative movement.

6. In a portable drilling rig, the combination of an open ended carrying frame, a substantially U-shapedtool supporting frame including two side members and a cross arm, connecting means between said frames aiording the longitudinal slidable and pivotal movement of said supporting frame relative to said carrying frame, a. drilling mechanism detachably secured to the cross arm of said supporting frame, said drilling mechanism being movable through the open end of said carrying frame from above to below the latter due to the pivotal movement of said supporting frame and longitudinally through said open end due to the slidable movement of said supporting frame, and means for establishing a rigid connection between said frames in any drilling position assumed by said drilling mechanism by virtue of said slidable and pivotal connection.

7. In a portable rig, the combination of a substantially flat U-shaped carrying frame including two side members and a cross end member, the space between said'side members being unobstructed to form an open end portion lor said frame extending from the free end of said side members to said cross end member, a wheel secured to the free end of each of said side members for sup-porting the same, each wheel being rotatable on an axle extending laterally from said frame, a substantially U-shaped tool supporting frame of a lesser width than that ci said carrying i'rame and having a drill supported thereby, the side members of said carrying frame between said wheels and said cross end member constituting guides having the side arms of said supporting frame connected thereto for slidable movement therebetween through the open end portion of said carrying frame, vand means for establishing a rigid connection between said frames in any drilling position assumed by said drill by virtue of the slidable movement of said supporting frame relative to said carrying frame.

8.1In a portable drilling rig, a carrying frame having an open center portion, supporting means for Asaid frame, a substantially U-shaped tool supporting frame having its legs pivotally and slidably connected to said vcarrying frame, the space between the pivotal and slidable connectionsbeing unobstructed, the possible slidable travel of said supporting frame on said carrying frame being equal to or greater than the length of the former whereby the cross arm of said tool supportingframe isadjustable'in height within a vertical plane from a horizontal position of said supporting framethrough a vertical position, and means for holding said tool supporting frame in adjusted position.

9. In a portable drilling rig, the combination of a carrying frame, supporting wheels for one end of lsaid frame, the space between said wheels being unobstructed, a substantially U-shaped tool supporting frame having its lower end portion connected to said carrying frame for pivotal and slidable movement relative thereto, a drilling mechanism carried by the upper portion of said supporting frame and extendingV between said wheels, said drilling mechanism due to the pivotal and slidable movement of said tool supporting frame being adjustable in height relative to said carrying frame in a manner affording the relation between said wheels and the center of mass of said drilling mechanism to remain substantially constant, and means for locking said frames against relative movement.

l0. In a portable drilling rig, a substantially U-shaped carrying frame, supporting wheels carried by said frame', a substantially U-shaped tool supporting frame carried by said carrying frame, means slidably connecting said tool supporting frame to said carrying frame, said tool supporting frame being located within said carrying frame to constitute in combination therewith a substantially rectangular structure, vsaid structure being adjustable in length by the slidable movement of said supporting frame, and means for locking said frames against relative movement.

11. In a portable drilling rig, a substantially U- shaped carrying frame, supporting wheels carried by said frame, a substantially U-shaped tool supporting frame carried by said carrying frame, means slidably connecting said tool supporting frame to said carrying frame, said tool supporting frame being located with respect to said carrying frame in a manner constituting in combina- .tion therewith a substantially flat rectangular structure, said structure due to the slidable movement of said tool supporting frame being adjustable from a length substantially equal to that of the carrying frame through a length substantially equal to the combined length of said frames, and means for locking said frames against relative movement.

12. In a drilling apparatus, a mechanism for supporting and guiding a drill comprising a carrying frame, a drill guiding frame supported by said carrying frame, a connecting member between said frames whereby said drill guiding frame may be secured above said carrying frame in various positions relative to the latter, a hoisting mechanism operatively connectable with said member for moving said drill guiding frame in said various positions, said hoisting mechanism comprising a stanchion having a winch and a rope receiving pulley aflixed thereto, and means for securing said stanchion to said carrying frame in different operative positions.

13. In a portable drilling rig, the combination causing the pivotal movement thereof, and means forming a part of said bearing for locking said stanchion to said carrying frame in variable op'- operative positions with respect to said supporting frame. f v

14. In a drilling apparatus, a mechanism for supporting and guiding a drill comprising a carrying frame, a drill guiding frame supported by the` latter, a connecting member between said frames whereby said drill guiding frame may be secured above said carrying frame in different positions relative thereto, a post slidably carried byV said carrying frame, a hoisting mechanism carried by said post'including a flexible element attached to said member for moving said drill guiding frame in different positions, and means for adjustably securing said post to said carrying frame. Y

15. In a drilling apparatus, a mechanism for supporting and guiding a drill comprising a car- Y flexible element attached to said member for effecting the pivotal movement thereof in one direction and checking it in the other direction, and means for securing said post to said carrying frame.

16. In a portable drilling rig, the combination of a carrying frame having an open end, supporting wheels for the open end of said frame rotatable on an axle extending laterally from said frame, the space between said wheels being unobstructed, a three sided tool supporting frame including two side legs united by a cross member, a slidable connection below said cross member between each of said legs and said carrying frame enabling the slidable longitudinal adjustment of said tool supporting frame relative to said carrying frame, the space between said connections being unobstructed, a rock drill mechanism supported by said cross member on an axis perpendicular to the slidable axis of said supporting frame, one end of said drilling mechanism being capable of swinging movement through the open end of the carrying frame and between said wheels and said connections, and means for locking the two frames against relative movement.

17. In a portable drilling rig, the combination of a substantially flat U-shaped carrying frame including two parallel side members united by a cross end member, a wheel secured to each of said side members near the free end thereof, a three sided tool supporting frame including two par- .allel side arms united by a cross member, a drill supported by said cross member, the side members of said carrying frame between said Wheels and said cross end member constituting guides each having one of said side arms connected thereto for slidable movement therebetween through the open end of said carrying frame, and means for establishing .a rigid connection between said frames in any drilling position assumed by said drill by virtue of the slidable movement of said supporting frame relative to said carrying frame.

18. In a portable drilling rig, the combination of .an open ended carrying frame including two parallel side members, supporting wheels secured to and extending higher than said frame, the space between said wheels being unobstructed, a three sided tool supporting frame including two side arms one leading upwardly from each of said side members and united above said carrying frame by a cross member, a drilling apparatus movably supported by said cross member, connecting means between each of said side arms and its corresponding side member enabling the slidable movement of said tool supporting frame longitudinally of said side member for movement of said drilling apparatus between said wheels through the open end of said carrying frame, and means for establishing a rigid connection between said frames.

19. In a portable drilling rig, the combination of a carrying frame, supporting wheels for one end of said frame rotatable on an axis extending laterally from said frame, the space between said wheels being unobstructed, a tool supporting frame including two side arms united by a cross member, a drilling mechanism carried by said cross memberand extending between said wheels, individual connecting means between each of said side arms and said carrying frame enabling the slidable movement of said tool supporting frame longitudinally of said carrying frame and the consequential slidable movement of said drilling mechanism between said wheels, and means for establishing a rigid connection between said frames.

20. In a portable drilling rig, the combination of a carrying frame formed with an open end, supporting Wheels secured to and extending higher than said frame, the space between said wheels being unobstructed, a three sided tool supporting frame including two side arms united by a cross member, a drilling apparatus carried by said cross member and extending into the open end of said carrying frame, individual connecting means between each of said side arms and said carrying frame enabling the slidable movement of said tool supporting frame longitudinally of said carrying frame and the consequential slidable movement of said drilling apparatus between said wheels through the open end of said carrying frame, and means for establishing a rigid connection between said frames.

21. In a drilling apparatus, a mechanism for supporting and guiding a drill including a substantially flat carrying frame, supporting wheels secured to and extending higher than said frame, the space between said wheels being unobstructed, bearings carried by said frame in slidable engagement therewith, a three sided tool supporting frame including two side legs united by a cross member, each of said side legs being slidably connected by said bearings to said carrying frame, a drill guiding frame pivotally secured to said cross member for pivotal movement between said wheels and said bearings, and means for holding said frames against relative movement.

22. In a portable drilling rig, the combination of an open ended carrying frame, a three sided tool supporting frame including two side members and a cross arm, connecting means between said frames affording the longitudinal slidable and pivotal movement of said supporting frame relative to said carrying frame, a drill guiding frame carried by the cross arm of said supporting frame, a pivotal connection between said drill guiding frame and cross arm, one end of said drill guiding frame being movable longitudinally and pivotally through the open end of the carrying frame due to the slidable and pivotal movement of said tool carrying frame and pivotally through said open end due to said pivotal connection, and means for establishing a rigid connection between said frames.

23. In a portable drilling rig, the combination of a substantially ilat carrying frame including two side members having an open space therebetween, supporting wheels secured to and extending higher than said frame, the space between said wheels being unobstructed, a drill guiding frame capable of longitudinal and elevational adjustments relative to said carrying frame, connecting means between said frames enabling the longitudinal and elevational adjustments of said drill guiding frame between said wheels through the open space of said carrying frame, said connecting means including slidable bearings in operative engagement with said side members, a mechanism operatively associated with said connecting means for effecting one of said adjustments, and means for locking said frames against relative movement.

JOI-1N C. CURTIS. 

